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  #11  
Old 11-26-2018, 07:02 AM
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thanks so much for those diagrams are really helpful I've struggled to find anything like that that makes sense so that clarified things a fair bit!

I went out in my break to have a look but it quite hard to see without taking the washer bottle and other plastics off and I only had 15 mins

I closed off the check valve so made it as standard and the vac dropped to -20 and then when revving the engine at a couple of times it made it vibrate to what seemed like near stalling so I don't know whether or not that's too much or too little air and I couldn't rev it and see what the actuator was doing ... id like to think this would throw up the engine management but it doesn't seem too...

the actual plunger itself hasn't been changed just the valve controlling the vacuum..

I also found a video on youtube with a chap testing the vacuum control valve and he refers to there being 25 inches on the primary of it so if anything mines lower than that!
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  #12  
Old 01-29-2019, 06:08 AM
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Hi guys thought Iíd post to say I finally got it sorted ! The first garage sent me down the wrong path blaming vacuum etc. Took it to an old school garage said what had happened and that I suspected possible turbo damage to to missing parts of the manifold so after removing the turbo which the first garage was reluctant to do and separating the turbo hot side we discovered the missing bit of metal in the sidewall of the turbo wedged in with the vg veins! And also hot side impellor fins all bent and damaged... so new turbo and all bodges removed and back to normal at last! I just canít understand how the first garage didnít see the damaged impellor when changing the manifold??!!
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  #13  
Old 01-30-2019, 03:45 PM
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Quote:
Originally Posted by Clunk84 View Post
Hi guys thought Iíd post to say I finally got it sorted ! The first garage sent me down the wrong path blaming vacuum etc. Took it to an old school garage said what had happened and that I suspected possible turbo damage to to missing parts of the manifold so after removing the turbo which the first garage was reluctant to do and separating the turbo hot side we discovered the missing bit of metal in the sidewall of the turbo wedged in with the vg veins! And also hot side impellor fins all bent and damaged... so new turbo and all bodges removed and back to normal at last! I just canít understand how the first garage didnít see the damaged impellor when changing the manifold??!!
Great to hear you are sorted but sorry to hear it cost you another turbo!

There's no easy way to see turbine damage like you describe when changing the exhaust manifold - that task may not involve opening up the "hot side" of the turbo, so it would be easy to miss. I suppose it depends on how the manifold was changed - either from over the top (after removing the valve cover) or from underneath (after removing the the turbo). Of course, I did neither and went in from the side!

But there's two important take-aways from all this: -

1. When installing the first turbo (28,000 miles ago?) the garage should likely have replaced the exhaust manifold at the same time. It would have had small cracks at that point - they go bad slowly. The extra cost would have been minimal (about 60 quid for a good cast manifold). I would NEVER bolt a new turbo to an old stainless manifold on an M57TU.....

2. When the garage discovered the old manifold was missing a piece of material, they should have searched deeper for it - it was clearly too big to pass through the turbo so it had to be in there.

Re. point 2. though - I guess the damage was already done (to the "new" turbo) so the only saving there would have been time and labour costs. But still...

At least you're rolling again.
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  #14  
Old 04-23-2019, 08:13 AM
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yeah cheers wayne.

thats exactly what i said to them to be honest and i did ask them when they changed the turbo the first time round if it was worth changing out the manifold and he said no it was all good.. hindsight hey if only id done a little more research before hand !! same old story!!
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